CVE-2024-0923 is a stack-based buffer overflow vulnerability identified in the Tenda AC10U router, specifically affecting firmware version 15.03.06.49_multi_TDE01. The vulnerability resides in the function formSetDeviceName, where improper handling of the devName argument allows an attacker to overflow the stack buffer. This type of vulnerability (CWE-121) can lead to corruption of the stack memory, potentially enabling arbitrary code execution or causing a denial of service. The vulnerability can be exploited remotely over the network without requiring user interaction, but it does require high privileges (PR:H) to exploit, indicating that some form of authentication or elevated access is necessary. The CVSS v3.1 base score is 4.7, categorized as medium severity, reflecting limited confidentiality, integrity, and availability impacts due to the requirement for privileges. The vendor, Tenda, was notified early but has not responded or issued a patch, and no official fixes are currently available. Although no known exploits are reported in the wild, the public disclosure of the vulnerability and exploit details increases the risk of exploitation. The vulnerability could be leveraged by attackers to disrupt network operations or gain further control over the device, which is critical in network infrastructure.

For European organizations, the impact of this vulnerability can be significant, especially for those relying on Tenda AC10U routers in their network infrastructure. Successful exploitation could lead to partial compromise of network devices, resulting in potential data leakage, network disruption, or pivoting to other internal systems. Given the medium severity and the need for authentication, the threat is more pronounced in environments where attackers can gain initial access or where default or weak credentials are used. This vulnerability could affect enterprises, ISPs, and critical infrastructure operators using these routers, potentially disrupting business continuity and exposing sensitive communications. The lack of vendor response and patch availability increases the window of exposure, necessitating immediate mitigation efforts. Additionally, the public availability of exploit code raises the risk of opportunistic attacks targeting vulnerable devices in Europe.

1. Immediate mitigation should focus on restricting access to the router's management interface to trusted networks only, using network segmentation and firewall rules to block unauthorized access. 2. Change all default and weak credentials to strong, unique passwords to reduce the risk of unauthorized privilege escalation. 3. Monitor network traffic and device logs for unusual activity that might indicate exploitation attempts. 4. If possible, disable remote management features or restrict them to VPN connections to limit exposure. 5. Consider replacing affected Tenda AC10U devices with alternative routers from vendors with active security support if patching is not forthcoming. 6. Implement network intrusion detection systems (NIDS) with signatures for known exploits targeting this vulnerability once available. 7. Maintain up-to-date asset inventories to identify all affected devices and prioritize remediation. 8. Engage with Tenda support channels periodically to check for any forthcoming patches or advisories.